Question

Two true breeding parents are crossed similar to Mendel's P generation. A tall plant is crossed with a short plant. What is the expected outcome for the F1 generation

Answer 1

Answer:

4/4 plants will be tall

Explanation:

For the gene that determines pea plant height, the allele for tallness is dominant to the short allele.  We'll say that a true-breeding tall plant is AA and a true-breeding short plant is aa.  So for every offspring, the first parent gives a capital A allele and the second parent gives a lowercase a allele, which means that every plant in the F1 generation will have the genotype Aa.  However, because that A/tall allele is dominant over the a/short allele, all of the plants will phenotypically appear tall.